99色精品-9色在线-99色在线-99色视频国产欧美日产一区二区三区_亚洲精品亚洲人成在线观看_四虎在线精品永久观看_免费一级a一片久久精

<pre id="whtkw"><acronym id="whtkw"></acronym></pre>

<pre id="whtkw"><legend id="whtkw"></legend></pre>

單項(xiàng)選擇題

The radiotelegraphy safety messages for condition indicating distress，urgency and safety，respectively，are（）.

A.SOS，ZZZ，XXX
B.SOS，UUU，SSS
C.SOS，XXX，TTT
D.SOS，TTT，UUU

你可能感興趣的試題

單項(xiàng)選擇題

The most likely time for oil pollution while bunkering is when（）.

A.final topping off is occurring
B.first starting to receive fuel
C.hoses are being blown down
D.hoses are disconnected and being capped

單項(xiàng)選擇題

Smoking in bed on a ship is prohibited（）.

A.at all times
B.during evening hours
C.unless another person is present
D.during drilling operations

<pre id="pnbcr"><strong id="pnbcr"></strong></pre>

<pre id="pnbcr"></pre>

<pre id="pnbcr"><acronym id="pnbcr"></acronym></pre>